how import/export csv in shopware 6

Hi i try to  import csv file in shopware 6 (( acoording to this document )) .I try to  test in locall server but it gives an error : https://testshopware.local/api/v1/_action/import-export/prepare

For test i try to export Default product but again it gives an error  https://testshopware.local/api/v1/_action/import-export/prepare

I google about this error ,But i can not find any issue about it.How i can fixed this error.

Generally can i use  import/export in local server ???

 

dev.log

[2020-04-30 15:08:24] request.INFO: Matched route "api.import_export_log.search". {"route":"api.import_export_log.search","route_parameters":{"_route":"api.import_export_log.search","_controller":"Shopware\\Core\\Framework\\Api\\Controller\\ApiController::search","entityName":"import-export-log","version":"1","path":""},"request_uri":"https://testshopware.local/api/v1/search/import-export-log","method":"POST"} []


[2020-04-30 15:08:27] request.INFO: Matched route "api.action.import_export.initiate". {"route":"api.action.import_export.initiate","route_parameters":{"_route":"api.action.import_export.initiate","_controller":"Shopware\\Core\\Content\\ImportExport\\Controller\\ImportExportActionController::initiate","version":"1"},"request_uri":"testshopware.local/api/v1/_action/import-export/prepare","method":"POST"} []